Loin pull and rib cut machine

ABSTRACT

A machine for automatically performing loin pulling and rib cutting operations on pork sides, the loin pulling operation including a rib sawing operation, a loin cutting operation and a loin push-off operation, and the rib cutting operation leaving the ribs on the belly part of the pork side. The machine automatically feeds pork sides, and cuts, saws and mechanically separates portions thereof.

United States Patent 1 I l 7 1 1 E Re. 28,508

. U1. Ci-z. ab e i; Neebel et al. Relssued Aug. 12, 1975 LOIN PULL AND RIB CUT MACHINE [56] References Cited [75] Inventors: Richard R. Neebel, Waterloo; f UNITED STATES PATENTS Clareme L- Harms, Cedar Falls; 2,510,173 6/1950 Harter 17/23 J m s D- Neebel, Denver, Richard 2,962,752 12/1960- Massengill 17/1 G E. Doerfer, Waterloo, all of Iowa 3,159,869 12/1964 Vogt et a1. 17/1 R i 3,581,336 6197], H" be 17 l G [73] Assignee: Container Corporation of America, I em 6 Cedar Falls Iowa Primary'Etaminer--Aldrich F. Liebery v v [22] Filed: Nov. 19, 1971 I 1zft0rney, Agent,' anrFiffifiwl'inare, Allegrett L'Nefiitt 21 -A 5p1. No.: 200,425 wtwff Related U-S. Patent Documents Relssue v A machine for automatically performing loin pulling [64] Patent N05 3,546,737 and rib cutting operations on pork sides, the loin pull- Issued: 1970 ing operation including a rib sawing operation, a loin PP N05 719,320 cutting operation and a 10in push-off operation, and Flled: 1968 the rib cutting operation leaving the ribs on the belly 1 part of the pork side. The machine automatically feeds [52] US. Cl. 17/1 G pork sides and cuts, Saws and mechanically Separates [51] Int. Cl. A22c 17/04 portions thereof.

..... 17/1 R, l G

[58] Field of Search v 58 Claims, '26 Drawing Figures Reissuecl Aug. 12, 1975 is Sheets-Sheet 1 Izz/eniors: Rickardfi zWeZeZ ('Zarence Lx rms James .D. @Vebel WWW Richard E Deer/e? @M J 772M Reissued Aug 12., 1975 15 Sheets-Sheet I W odmzfiw rw %%w w. W R W Q I g rcDM EN mwa E: Z Z s wc rw R J v Qmfi mwm NL m ml hw Reissued Aug. 12, 1975 Re. 28,508

13 Sheets-Sheet 4.

Rickard Efloerf'er Reissud Aug. 12, 1975 13 Shasta-Sheet 6 $4. 7 ZWMZ WW5 MWMW n e. MWUML wreaw w 5% J a Reissued Aug; 12, 1975 13 Sheets-Sheet 7 Q I71 Y/ 71 0715:

Richard A M ebeZ (Zarence Luiarnzs afamesfl M ebeZ Richard E Doerf'er Reissued Aug. 12, 1975 13 Sheets-Sheet 10 r a i m M m ww rw My; L. M wp l/MW Reissued Aug. 12, 1975 Re. 28,508

13 Sheets-Sheet 11 fF 5'. 21. C6

98 F 7 Z j? w a l .94

1 5 I l 4 T f s I 1 1 i 4 4 I u 2 i 102 F Jfirf'enzfors. Richard R. Webel Clarence Lflczrms fczznea .D. M ebd Richard E Boer/'67 Reissuecl Aug. 12, 1915 Re. 28,508

13 Sheets-Sheet 13 I 157 1/(272 ions: Ric/z a rd R. WefieZ ('Zaren e Yarms James D. M ebeZ Rz'chardlf Doerf'er WW Mil s.

LOIN PULL AND RIB CUT MACHINE Matter enclosed in heavy brackets appears in the original patent but forms no part of this reissue specification; matter printed in italics indicates the additions made by reissue.

BACKGROUND AND SUMMARY OF THE INVENTION One object of the invention is to provide a functional machine for automatically completing all of the above enumerated operations with less manual labor and more uniformity of the resulting pork cuts than are possible by trained operators.

Another object is to provide a mechanism to saw through the ribs in a selt determined direction depend ing on the size and shape of the pork sides.

Still another object is to cut the loin in a predetermined pattern conforming to the natural configuration of the pork side and with a controlled quantity of fatback.

A further object is to automatically remove the loin from the remainder of the side and allow such remainder to proceed to the rib cutting mechanism of the machine.

Still a further object is to automatically cut out the remaining ribs from the side in a plane as close to the ribs as possible and with a blade which is withdrawn in a line corresponding with the ends of the ribs. thus minimizing the meat lost with the ribs.

With these and other objects in view. our invention consists in the construction. arrangement and combination of the various parts of our loin pull and rib cut machine. whereby the objects above contemplated are attained. as hereinafter more fully set forth. pointed out in our claims and illustrated in detail on the accompanying drawings. wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a plan view of a loin pull and rib cut machine embodying our invention. slightly more than onehalf (the right hall) of the machine beingshown;

FIG. 2 is a vertical sectional view on the line 2-2 of FIG. I;

FIG. 3 is an enlargement of a portion of FIG. 2 showing mechanism for initially advancing a pork side into the machine;

FIG. 4 is a vertical sectional view on the line 4-4 of FIG. 3;

FIGI 5 is a vertical sectional view on the line 55 of FIG. 3'.

FIG. (1 is an enlargement of a transversely mounted tapered lug shown in FIGS. 4 and 5'.

FIG. 7 is an enlarged vertical sectional view on the lines 77 of FIGS. I and 2:

FIG. 7A is a diagrammatic view representing a continuation of the left hand end of FIG. 7 and showing an arrangement for permitting both vertical and horizontal movements of a secondary carriage member;

FIG. 8 is a detail sectional view on the line 88 of FIG. 7;

FIG. 9 is a plan view of the parts of our machine shown in FIG. 7 and shows a loin scribe saw. a scribe saw shoe and a loin pull knife in an initial position during the operation of the machine;

FIG. I0 is a vertical sectional view on the line IUII) of FIG. II showing a pork side operated switch:

FIGI II is a view similar to FIG. 9 showing the saw. shoe and knife in a different position during a further operation of the machine;

FIG. I2 is a view similar to a portion of FIG. I I. and as taken on the line IIII of FIG. 7 to show more clearly the relation of details of the saw. shoe and knife:

FIG. 13 is an enlarged side elevation of a portion of FIG. 2 above the bracket 13 thereof and as taken on the line I3I3 of FIG. 9;

FIG. 14 is an enlarged elevation of a portion of FIG. 2 as taken on the line I4I4 thereof;

FIG. 15 is a sectional view taken on the line I5I5 of FIG. I4.

FIG. 16 is a sectional view taken on the line I6I6 of FIG. 14;

FIG. 17 is an end view of a drive drum shown in FIG. 14 and as viewed at the line 17-17 thereof;

FIG. 18 is an enlarged elevation of a portion of our machine adjacent the line l8l8 of FIG. 2;

FIG. 19 is an enlargedsectional view of a portion of FIG. 18 found in the lower left quadrant thereof;

FIG. 20 is a detail sectional view on the line 202() of FIG. 19;

FIG. 21 is an enlarged elevation of a portion of FIG. 2 above the bracket 21 and shows the parts in reverse to better illustrate details thereof;

FIG. 22 is an enlarged end view of a roller illustrated in FIG. 21;

FIG. 23 is an enlarged elevation of the portion of FIG. 2 above the bracket 23 thereof;

FIG. 24 is a diagrammatic view of eight air cylinders and the controls therefor used in our machine; and

FIG. 25 is a plan view of the portion of the machine shown in FIG. 23.

LOIN PULL OPERATION On the accompanying drawings we have used the reference numeral 26 to designate a pork side conveyor to which right pork sides (RS) may be delivered by an infeed conveyor 27'. A'series of rollers 29 are illustrated in FIGS. I and 2 to span the space between the discharge end of the conveyor 27 and the intake end of the conveyor 26. The conveyors 26 and 27 may be driven in synchronism with each other and in any suitable manner such as a motor 31 driving a speed re ducer 33. and through a chain 35 driving a shaft 37 as shown in FIG. I. FIGQ I- also illustrates a chain drive 39 between the intake end of the conveyor 26 and the discharge end of the conveyor 27.

The direction of travel of the conveyors is in accordance with an arrow 43 adjacent the right hand end of FIG. I. Considering ourmachine as oriented in accordance with the arrow ll the left hand edges of the conveyors 26 and 27 are cut off with broken lines 26a and 27a. At 41 the fore-andaft center line of the machine is indicated.

The mechanism of our machine in FIG. I is somewhat diagrammatically illustrated with reference characters F indicating various parts of a stationary frame. Such mechanism is for the purpose of automatic loin pulling and rib cutting operations for right pork sides whereas the rest of the machine (to the left of the center line 41 is identical except it is a mirrored opposite of that portion of the machine to the right of the center line and is for left pork sides. We therefore deem it unnecessary to illustrate the left half of the machine.

In FIG. I we show right pork sides RS to indicate the position thereof on the infeed conveyor 27 in relation .o a side rail 28 against which the operator of the ma shine holds the side RS with the backbone of the side ying parallel to and in full length contact with the rail. This rail is corrugated in vertical cross section as shown n FIG. 4 to reduce fractional drag on the sides s hey move through the machine. The ribs 45 of thc )ork side RS (shown in FIGS. 5 and 13] are uppermost ind are transverse to the direction of travel of the in 'eed conveyor 27 and the pork side conveyor 26.

The pork side R5 is moved toward the cutting and .awing section of the machine. which will later be delcribed. by the pork side conveyor 26. The side IRS is ield down and pulled toward a cutter arm 30 (which garries a loin scribe saw 40 and a loin pull knife 42 by .tud ponts 32 mounted on a gripper chain 3-1. The .pced of the pork side conveyor 26 and the. gripper :hain '34 are synchronized. anda gripper chain rider trm 36 is inclined downwardly in the direction of travel better hold the side RS in a firm position against coneyor lugs 38 (see FIGS. 3. 4. 7 and I] as it reaches and passes through the loin scribe saw 40 and the loin ull knife 42 (see FIGS. 7. 9. II and I3].

The gripper chain 34 contains transversely mounted ugs 44 with five of the pointed studs 32 mounted on :ach lug. The lugs 44 are tapered as shown in FIGS. 4. i and 6 in order to better conform to the contour of the fitlCk bone of the side RS which is pulled by them .hrough the loin scribe saw 40 and the loin pull knife 12. The rider arm 36 is forced down against the center if the side RS by its own weight as well as by an adjusttble pneumatic cylinder CI acting as an air spring. Adustment is accomplished by supplying compressed air :o the cylinder through an adjustable pressure regulator PR1 as shown diagrammatically in FIG. 24. This action ielps to position and hold the side R for better sawing ind cutting action.

At the outgoing end of the gripper chain 34 there is .l loin depressor foot 48 (FIGS. 1 and 3) carried by a frame 55 for the gripper chain. which forces the side RS off the gripper chain 34 and down against the pork side conveyor 26, and also holds the side R5 in position for sawing and ctltting.

The gripper chain 34 as shown in FIGS. 3 and 4 is of .lual character and is trained around a pair of dual iprockets 47 and 49, shafts SI and 53 being provided therefor. The frame 55 is associated with the gripper :hain. its sprockets and shafts, and is pivoted about the .ixis of the shaft 5]. The left hand end of the frame 55 is supported by a yoke 57, a piston rod 59 and a pneumatic cylinder ('2. The cylinder C2 also acts as an air -;pring. a pressure regulator PR2 being provided therefor as shown in FIG. 24. The rider arm 36 is supported by a piston rod 63 and the pneumatic cylinder (1, the right hand end of the arm being mounted on a bracket 65 pivoted about the axis of the shaft 51. The frame 55 is provided with three spring biased hold-down rollers 57 (see FIG. 5 so as to varial vly conform the successive stud points 32 to the side RS as it passes under them as shown by dot-and-dash lines in FIGS 3 and 4.

For rotating the shaft SI and thereby actuating the gripper chain 34 a drive chain ()9 shown in FIG. I is driven from a cross shaft 7I which is the output shaft front a speed reducer 73 driven by an electric motor 75. Between the chain 69 and the shaft 5| a safety slip clutch is preferably provided for protection of the drive mechanism for the loin pull and rib cut operations. The shaft 7] evlends transversely of the machine (ill to drive the leftside mechanism in synchronism with the right side mechanism. and the speed reducers 33 and 73 are adjusted for'obtaining the same surface speed for the gripper chain 34 as for the conveyors 26 and 27.

An interval of at least 24" is allowed between successive sides RS on the conveyors 26 and 27 as shown in FIG. I in order that the cutter arm shown and the loin scribe saw .40 shown in FIGS. 7, 9. II and I2 can be returned to their starting position by the automatic action of mechanical linkage including a lever 50 se cured to the cutter arm 30 and actuated by a I: hydraulie] pneumatic cylinder C3 acting as an air spring through the action of a pressure regulator PR3 shown in FIG. 24. The entire assembly is pivotally mounted by securing the arm 30 to a vertical shaft 77 shown in FIGS. 7, 9 and II, the shaft 77 being journalled in a bracket 79 secured to a secondary carriage member 76, as shown in FIG. 7A. the carriage member 76 has a pair of rods 81 which are freely and vertically slidable in a primary carriage member 83. The carriage member 83 is freely and horizontally slidable on a pair of rods 85 carried by the frame F of the machine.

FIGS. 11 and 12 show a normal position for the saw parallel to the travel of the pork side conveyor 26, and FIG. 9 shows an angularly disposed position rela' tive thereto for purposes which will hereinafter appear. The cutter arm 30 also carries a scribe saw shoe 52 (FIGS. 7 and 12) which functionally positions both the loin scribe saw 40 and the loin pull knife 42 for their initial cuts. The shoe 52 is held down by the weight of the cutter arm 30 and the elements 76 and 8] shown in FIG. 7A. and is pulled horizontally by a cable 54 terminating in a counterweight 56 shown diagrammatically in FIG. 7. The angle of the cable 54 is such that vertical as well as a horizontal pull is obtained. the vertical pull involving the rods 8] sliding in the primary carriage member 83 and counteracting to some extent the weight of the arm 30. etc. as above referred to. and the horizontal pull involving the member 83 sliding on the rods 85. Thus. the dual purpose of the counter weight 56 is to off-set the weight of the cutter arm 30. etc. for easier maneuverability and to pull the scribe saw shoe 52 against the up-curved portion of the ribs of the side RS according to the arrow 87 in FIG. 7. FIG. 7 also has legends as to parts of the side RS to clarify reference to the operations on the side hereinafter referred to.

During initial contact of the saw blade 40 with the side RS. it is diagonal (FIG. 9) to the line of conveyor 26 travel and the horizontal direction of its cut is determined by the position of the scribe saw shoe 52 at it rests on the side and follows the contour of the back bone of the side. The vertical level of the saw cut is determincd by the elevation of the scribe saw shoe 52 throughout the entire travel of the side RS thereunder. The scribe saw 40 is a circular saw blade driven by an angle head drive 130 and a flexible power cable 58 (see FIGS. I and 13) from a motor centrally mounted above the work area on an upper portion of the frame F. A scribe saw arm 64 which carries the shoe 52 and the saw 40 are horizontally stabilized by a pair of rollers 66 which ride up and down in a straddling position on the left hand (considered according to arrow 43) vertical side 42a of the loin pulling knife 42 as shown in FIGS. 7 and 12. The loin pull knife 42 is mounted on the cutting arm 30 but during part of the cutting cycle it is independently controlled as indirection andcltwation of cut by mechanical linkage 68 (FIGS. 7. 9 and l I pivoted to a bracket 62 mounted on the secondary carriage member 76. The loin pull knife '42 is positioned slightly behind the scribe saw 40 with the vertical portion 42a always following directly behind and in line with the scribe saw through the cut made through the rib bones 4S bythe saw. In FIG. 9 it will be noted that the vertical portion 42b of the knife 42 is parallel to the arrow 43 but th e'portion 42a is diagonal (the initial contact mentioned at the beginning of this paragraph). During the last part of the loin cut operation shown in FIG. 11 both portions 42a and 42b arc parallel to the arrow 43 as permitted by flexibility of the knife 42.

A unique feature of the vertical positioning mechanism for the loin pull knife 42 is a stationary cam track 70 (FIG. 13] and a roller 72 which serve to lift the knife 42 at the moment coinciding with the position of the side RS when thc 'shoulder thereof has passed the knife.

piston rod 93 in a cylinder C4. The piston rod )3 acts normally as a supporting guide rod for the scribe saw 40 and the shoe 52 through the scribe saw arm 64. The cylinder C4 can be pneumatically actuated by the operation of a jam valve (FIG. 24) for lifting the saw and shoe as will hereinafter appear.

The min-.11 position (FIG. 9) of the loin time 42 is LIC- termined by the vertical and horizontal position of the scribe saw shoe 52. However as the side RS is moved further along by the pork side conveyor 26 it depresses a wire loop switch actuator 74 (FIGS. 9. l and II of a micro-switeh SW1 which then activates the hydraulic cylinder C3 (see FIG. 24] which repositions the entire cutter arm and thereby the saw 40 and the knife 42 into another position shown in FIG. 11 by the switch opening a solenoid valve SVI. FIGS. 7 and 13 also show the parts in this other position.

The solenoid valve SVI is a double acting type with spring return. supply inlet I. normal outlet 2, operated outlet 3 and exhaust 4. Solenoid valvcs SV2 and V3 referred to later. are the same type. The cylinder C3 is also under control of the switch SM] and the solenoid valve SVI (see FIG. 24).;

In changiiig from the initial position of FIG. 9 to this other position shown'in FIG. ]I. the roller 72 passes over the hump of the cam track 70 as further explained hereinbcfore. Thus. a momentary lifting of the loin pull knife 42 is effected and it is then returned to its previous elevation but in its new direction ofcutting action shown in FIG. I]. This is necessary in order to follow the natural contour of the side RS at that point. The

saw and knife are now in a position to continue cutting down the length of the side RS in the direction of the conveyor 26 instead of diagonally. This change in cutting direction is necessary due to the fact that thc loin (shaded area on the sides RS in-FIG. I) is broader at the lead end than it is shortly thereafter. The result is. first a curved saw cut path. and then a straight saw cut path down the length of the side RS.

Also when the cutter arm 30 isriiovcd into this final position of'FIG. I1..the vertical portion 42b ofthe loin pull knife 42 contacts a stop hunon78 as in FIG. 7 to .close thc loin knife (spring its sides closer together) so it will-cut a narrower h rizontal portion ofthc loin from 6 Best. A'mtmnte Copy the side RS as shown. The knife will be found more open in FIG. 9. Such closing of the knife is possible because of its flexible character and is permitted by the mechanical linkage 68. During this time the knife 42 is also positioned closer to the side rail 28.

The stop button 78 is automatically adjusted by means of a cam lever I27 shown in FIG. 7 pivoted to the frame F and carrying a cam roller 128. One of the rods 81 as shown in FIG. 7 has a roller engaging arm 12) which at times engages the roller 128. The stop button 78 controls the amount of fat left on the loin. This is accomplished by the variation in elevation ofthe scribe saw shoe 52 which rides on the rib section. As the sc ribe saw shoe 52 changes elevation the cutter arm 30 also changes elevation. This in turn actuates the stop button 78 to control the horizontal location of the knife, thus controlling the fat thickness left on the loin after cutting. Normally the heavier or thicker the side RS is. the thicker the fat back. Thus. distance 100 in' creases on heavier sides to adjust for the thicker fat backs.

When the side RS has tripped the switch wire 74 to close the switch SW1, a loin drivedrum (FIGS. I4 and I7) is automatically forced down on the already cut portion of the loin which is still lying on top of the remainder of the side RS in order to help pull the entire side through the loin cutting and sawing operation and on to the next station of the machine. This is accomplished through a pressure regulator PR5 by a cylinder C5 also actuated by the switch SW1 and the solenoid valve SVI as illustrated diagrammatically in FIG. 24. The cylinder C5 normally keeps the drum 80 raised by How of compressed air from outlet 2 of the valve SVI.

Two sizes of loin knives 42 may be used on our machine depending on whether regular or heavy sides RS are being processed. With respect to these pork sides. regular sides are 24 to 30 inches long and heavy sides are 30 to 40 inches long as a general rule. A heavier and wider knife is used for heavy sides and requires an adjustment along the arm 30 which holds the scribe saw 40 inorder to cut a wider loin portion. A wing nut 82a is provided for this purpose (FIGS. 7. 9. II and 13). The knives 43 themselves are secured to the cutter arm 30 for quick exchange by a wing nut 82.

Preceding the wire loop switch actuator 74 and extending from the lower edge of the corrugated side rail 28 is a deflector bar 84 (FIGS. 7 and S) which forces the fatback ofthe side RS up against the loin knife 42, thus giving a maximum sized cut of loin by preventing the fatback from packing down into the adjacent corner between the frame F and the rail 28.

After the side RS has passed by the wire loop switch actuator 74 and the actuator has returned to its normal position. the cylinder C3 which controls the two posi tions FIG. 9 and l I of the saw 40 and the knife 42 automatically returns the saw and knife to their respective starting positions of FIG. 9 through the action of the switch SW] and the solenoid \alvc SYI and at the same time the loin drive-drum 80 is raised through the action of the same switch and valve shown in FIG. 24.

In an emergency the machine operator can raise (and later lower) the gripper chain rider arm 36 (Cl the gripper chain 34 (C2). the saw 41) and shoe 52 (C4) and the drum 80 (C5) pneumatically by closing (and later opening) the jam valve J as evident in FIG. 24.

The drive drum 80 as shown in FIGS. I. 2 and 14 to lo inclusive is mounted on a shaft 86 connected by uni versal joint III} with a shaft I22 which isjournallcd in the frame F. The shaft 122 is driven by a chain l2I as shown in FIG. I from a counter shaft 97 which in turn is driven by a chain 99 from the shaft SI. A bearing I03 is supported by a yoke I05 and a piston rod 107 of the cylinder CS. and the shaft 86 is guided by a bearing I09 thereof movable in a slot 11 I of a portion of the frame F of the machine.

After the loin has been pulled. the side RS (now in two pieces] proceeds with the pork side conveyor 26 toward the next (loin push-off) operation. As the corrugated side rail 28 .ends. the back hone side of the side RS is held in position by a horizontal guide rail bar 88 (FIGS. 18 and 21) located in line with the railing 28 and above the conveyor 26. This guide rail bar is movable. pivoting outward from an axis I13 the same as a pair of spring loaded kick off shoes 90. FIG. 19 shows a spring I19 to effect such loading.

The kick off shoes 90 are inclined upwardly at their lead ends (see FIG. 2] wherein the view is from the side of the machine opposite that shown in FIGS. 1. 2. 3 and 13 so travel is opposite as indicated by an arrow I in FIG. I3) so that they may ride up on the side RS as it proceeds down the conveyor 26. The shoes 90 are located on either side of a pair of freely rotating knob covered drums 92 as shown in FIG. 21. The kick off shoes 90 are slidably supported in a welded tube assenv bly 94 and the pair of shoes and the guide rail bar 88 move together as a unit about the axis as shown by solid and dot-and-dash lines in FIG. 18. Also the shoes 90 have limited oscillation possibilities as illustrated in FIG. 20 to allow them to align themselves for the purpose of dropping into the scribe saw cut at I23 FIGS. 7 and 13).

When the side RS actuates a trip arm 96 shown in FIG. 21. an actuating arm 98 forming part ofthe assembly 94 is pivoted from the full line position in FIG. I8 to the dot-and-dash line position thereof by a cylinder C6 so that the kick off shoes 90 will drag transversely across the side RS. drop into the saw cut at 123 and push the pulled lion 124 off the side of the conveyor 26 and onto a chute I where it falls into a loin cart or onto a loin conveyor 131 or the like. The trip arm 96 closes a switch SW2 which through a solenoid valve SV2 as shown in FIG. 24 controls the flow of compressed air to the cylinder C6 for moving the actuating arm 98 from the full line position to the dot-and-dash line position of FIG. I8. At the same time the switch SW2 effects lowering of the knob covered drums 92 (controlled by a pressure regulator PR7a) which are normally in the raised position through the action of a cylinder C7 and a pressure regulator PR7 (sec FIGS. 18, 2I and 24).

Slightly prececding the above operation and in order to hold the side RS in position during the loin push-off operation. the pair of transversely mounted knob covered drums 92 drop onto the remaining rib section of the side RS under the pressure of the pneumatic cylinder C7. The two drums 92 are supported on a side mounted frame 102 which pivots up and down. This holding operation is thus also triggered by the trip arm 96 of the switch SW2. The knob covered drums 92 are raised automatically after the side RS has passed by and allowed the trip arm 96 to resume its normal vertical position shown in FIG. 2].

RIB CUT OPERATION After the loin has been removed. the remaining por tion ofthe side RS proceeds down the conveyor 26 and is contacted by the first of two knobbed drive drums 104 larger than the first pair of drums 92) powered to propel the side RS through a rib cutting knife I06 (sec FIGS 23 and 25 at a speed synchronized with the con veyor drive. Such synchronized drive is attained by a chain 126 from the shaft 97 as shown in FIGS. 1 and 2. This portion of the conveyor has a side rail 28a similar to the side rail 28. The rib cutting knife I06 is arranged diagonally to the direction of conveyor travel as shown in FIGS. 1 and 25 for two reasons;

I By entering the side RS at one corner rather than along the entire leading edge of the knife. the meat is more easily drawn past the knife.

(2) The ends of the ribs are diagonal to the side RS itself and thus when the knife 106 is elevated to with draw it from the side RS it leaves the meat on a diagonal line corresponding to the ends of the ribs.

The rib knife I06 is sharpened with the bevel on the upper side and is mounted with the leading edge of the knife higher than the trailing edge in respect to the pork side conveyor 26 as shown in section at 106a in FIG. 23. This arrangement provides an angle of attack which forces the knife up in a plowing effect which forces it to cut close to the bottom of the ribs 45. A hold down plate I08 is mounted at the bottom of and between the two drive drums 104. Its purpose is to prevent the side RS from sticking to the first drive drum and to force the side RS against the lugs 38 of the conveyor 26. The rib cutting knife 106 is automatically positioned vertically by the thickness of the side RS and it cuts immediately under the ribs. The angle at which the rib cutting knife 106 is set and the angle at which the edge is sharpened as above described satisfies a requirement that the knife cut as close to the under side of the ribs as possible. This knife is designed with a curvature throughout its length which corresponds to the natural curvature of the ribs and thus provides most effective cutting.

When the leading edge of the side RS strikes an actuator wire 110 located downstream of the second drive drum 104 (see FIGS. 23 and 25). there is a delayed action pneumatic force supplied to a pair of arms I I6 and 116a on which the drive drums 104, hold down plate I08 and rib cutting knife I06 are mounted by a pneumatic cylinder CS (normally under control of a pressure regulator valve PR8). lifting the arm 1 16-11621 upward and pulling the knife 106 free from the meat. This withdrawal of the knife I06 is so timed as to cut off the ribs on a line corresponding to the upstream ends thereof. Part of the arm [16a serves as a housing for the chain 126.

The delayed action referred to may be had by the arrangement shown diagrammatically in FIG. 24, a switch SW3 being actuated by the wire I10 and in turn energizing a solenoid valve SV3( D). the D indicating a delayed action type of valve.

Since the knife I06 is the lowest member attached to the arm 1I6-I 16a. the side RS (FIGS. 23 and 25) is no longer propelled by the pair of drive drums I04. Therefore. an independently mounted drive wheel I14 continues to pull the side RS down the conveyor and free of the rib cutting knife I06. The drive wheel H4 and its drive motor are mounted in a separate pair of arms I32 and 132a which are free to move up and down. loosely pivoting on pivot pins II8 at opposite sides or the right and left sides of the machine. The two arms 132 and 132a. and a cross member I17. form a frame for mounting the wheel H4 for the side R5. at similar wheel (not shown for the other pork side (also not shown) and its motor 115. The loose pivoting rcferred to allows either of the drive wheels 114 (the right hand one shown) or the left hand one (not shown) to independently seek their own elevation as dictated by the right and left pork sides respectively.

An operator at the discharge end of the machine can lift the ribs from the remaining portion of the side RS and place them in a separate container. conveyor or the like. thus completing the rib cutting operation.

With further reference to FIG. 24.. only the essential operation of the pneumatic circuit is disclosed. Solenoid valves are indicated as actuated by switches without going into detail with respect to electric circuits therefore. Since circuitry of this character is well known in the automatic machine art. we deem it unnecessary to illustrate the same in detail. FIG. 24 also serves as a summary of the machine as all operations are shown in sequence. cylinders Cl and C2 representing a preliminary feed station. cylinders C3 and C4 a loin pull station. cylinder C5 an intermediate feed station. cylinder C6 a push-off station. cylinder C7 a second intermediate feed station. and cylinder C8 a rib cut station. Beyond the rib cut station. the independent motor driven wheel 114 of FIG. 23 constitutes a final feed station.

From the foregoing specification it will be obvious that we have provided a loin pull and rib cut machine which greatly reduces the normal work and hand labor of loin pulling and rib cutting operations. thus reducing the labor force. At the same time the quality of the loin pulled and the ribs cut are maximum and labor costs are reduced because of reducing the amount of subsequent hand trimming of fat from the loins and ribs. The operation by our machine are performed in such manner that the parts thereof are automatically adjusted for each cutting operation to the individual size and shape of each side RS. While these operations are being performed by the right side of the machine. the left side is simultaneously performing the same operations on left sides in an obvious manner. and the only attention required by operators is one to feed the right and left sides onto the infeed conveyor 27 and another to remove the ribs and rib meat from the fat backs which are discharged off the pork side conveyor 26 (upper left hand end in FIG. 1).

We claim as our invention:

1. In a loin pull and rib cut machine. conveyor means operable to convey pork sides through said machine.

said machine having a loin pull station. a loin push-off station and a rib cut station. loin pull mechanism at said loin pull station comprising a scribe saw and a U- shaped loin pull knife. said scribe saw being positioned with respect to said conveyor means to scribe the ribs of the pork side adjacent one edge of the loin. said loin pull knife having a portion immediately following said scribe saw and a portion to cut under the loin. means for causing said scribe saw and said portion immediately following it to follow the shape of the loin comprising a shoe carried by said scribe saw and adapted to follow the contour ofthe back bone of the pork side. means to bias said shoe toward the back bone. means at said push-off station to push the cut loin from the pork side. and means at said rib cut station to cut the ribs from the pork side.

2. A loin pull and rib cut machine according to claim I wherein said means for causing said scribe saw and said portion of said loin pull knife immediately following said scribe saw to follow the shape of the loin comprises a fluid pressure cylinder normally operable to position said scribe at a diagonal to the line of travel of said conveyor means, and means responsive to the pork side when it arrives at a predetermined position on said conveyor means to operate said cylinder to position said scribe saw substantially parallel to the line of travel of said conveyor means.

3. A loin pull and rib cut machine according to claim 2 including means operable to lift said loin pull knife. said lift means comprising a roller coacting with a cam as a result of said cylinder responding to said means re sponsive to the pork side when it arrives at a predetermined position on said conveyor means.

4. A loin pull and rib cut machine according to claim 1 wherein additional conveyor means are provided for positively advancing the pork side before it reaches said loin pull station and comprises a gripper conveyor having gripper lugs biased to engage the back bone portion of the pork side.

5. A loin pull and rib cut machine according to claim 4 wherein means is provided between said loin pull sta tion and said push tf'station for feeding the pork side comprising a knobi i'cd drive-drum. and means to bias said drum toward the pork side comprising fluid pressure operated means also responsive to the position of the pork side when it arrives at said predetermined position.

6. A loin pull and rib cut machine according to claim 4 wherein fluid pressure operated means is provided to operate said push-off'means. and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure operated means.

7. A loin pull and rib cut machine according to claim 4 wherein means is provided between said push-offstation and said rib cut station to feed the pork side and comprises knobbed drums and means to bias said drums against the pork side.

8. A loin pull and rib cut machine according to claim 4 wherein said rib cut means comprises a rib cut knife and freely rotatable drive-drums to hold the pork side against said conveyor means under bias.

9. A loin pull and rib cut machine according to claim 4 wherein fluid pressure operated means is provided to operate said push-off means. said push-off means having spring extended shoes to enter the saw cut in the pork side and engage the adjacent edge of the loin to effect push-off thereof with respect to the remaining portion of the pork side. and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure operated means.

10. A loin pull and rib cut machine according to claim 4 wherein said means to bias said gripper chain against the pork side comprises fluid pressure operated cylinder means and an adjustable pressure regulator for supplying fluid under pressure thereto.

11. A loin pull and rib cut machine according to claim 10 wherein said means to bias said shoe toward the back bone comprises a fluid pressure operated cylinder. and means responsive to the pork side when it arrives at a predetermined position to control said cylinder.

A loin pull and rib cut machine according to claim 11 wherein a fluid pressure operated means is connected with said scribe saw and said shoe for elevating them and a manually actuated jam valve is provided for actuating said cylinder.

13. A loin pull and rib cut machine according to claim 12 wherein said means for causing said scribe saw and said first portion of said loin knife to follow the shape of the loin comprises a fluid pressure cylinder normally operable to position said scribe saw at a diagonal to the line of travel of said convey or means. means responsive to the pork side when it arrives at a predetermincd position on said conveyor means to operate said cylinder to position said scribe saw substantially parallel to the line of travel of said conveyor means. wherein fluid pressure operated means is provided to operate said push-off means. and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pres sure means.

14. A loin pull and rib cut machine according to claim 12 wherein means are provided for actuating said jam valve so as to operate said fluid pressure operated cylinder means in the reverse direction.

15. A loin pull and rib cut machine according to claim 10 wherein a drive-drum is provided to feeding the pork side between said loin pull station and said push-off station. and a fluid pressure operated cylinder biases said drive-drum toward said conveyor means and is controlled by said means responsive to the pork side when it arrives at a predetermined position.

16. A loin pull and rib cut machine according to claim 4 wherein a rider arm is biased to engage the rib portion of the pork side and force it toward said eonvcyor means.

17. A loin pull and rib cut machine according to claim 4 wherein said lugs of said gripper conveyor are tapered and are provided with pork side engaging points and said conveyor means has lugs thereon opposite said gripper conveyor to prevent slippage of said conveyor means under the pork sides.

18. A loin pull and rib cut machine according to claim 12 wherein said jam valve also actuates said fluid pressure operated cylinder means to bias said gripper conveyor against the pork side in a contra-biasing dircction.

19. A loin pull and rib cut machine according to claim 18 wherein a rider arm is biased to engage the rib portion of the pork side. and fluid pressure operated means is provided to effect such bias. said jam valve being also operable to actuate said last mentioned fluid pressure operated means in a contra-biasing direction.

20. A loin pull and rib cut machine according to claim 1 wherein means is provided between said loin pull station and said push off station to bias the pork side against said conveyor means.

21. A loin pull and rib cut machine according to claim 20 wherein means is provided between said pushoff station and said rib cut station to feed the pork side and comprises knobbed drums. and means to bias said drums against the pork side.

22. A loin pull and rib cut machine according to claim 20 wherein said rib cut means comprises a rib cut knife and freely rotatable drivc'drums biased to hold the pork side against said conveyor means.

23. A loin pull and rib cut machine according to claim 20 wherein said mcansto bias the pork side against said conveyor means comprises a knobbcd drive-drum and fluid pressure operated means normally biasing said drive-drum away from the pork side. and including means responsive to the pork side when it arrives at a predetermined position on said conveyor means and being also operable to actuate said fluid pressure operated means in a direction contranormal to engage said drive-drum with the pork side.

24. A loin pull and rib cut machine according to claim 23 wherein a jam valve is provided to actuate said fluid pressure operated means normally biasing said drive-drum away from the pork side in said normally biased direction.

25. A loin pull and rib cut machine according to claim 20 whererin means is provided responsive to the pork side when it arrives at a predetermined position on said conveyor means to operate said means between said loin pull station and said push-off station to bias the pork side against said conveyor means.

26. A loin pull and rib cut machine according to claim 1 wherein fluid pressure opcratcd means is provided to operate said push-off means. and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure means.

27. A loin pull and rib cut machine according to claim 26 wherein means is provided between said pushoff station and said rib cut station to feed the pork side and comprises knobbed drums. and means to bias said drums against the pork side.

28. A loin pull and rib cut machine according to claim 26 wherein said rib cut means comprises a rib cut knife and freely rotatable drive-drums to hold the pork side against said conveyor means under bias.

29. A loin pull and rib cut machine according to claim 1 wherein means is provided between said pushoff station and said rib cut station to further feed the pork side and comprises a knobbed drum and means to bias said drum against the pork side.

30. A loin pull and rib cut machine according to claim 29 wherein said rib cut means comprises a rib cut knife and freely rotatable drive-drums to bias the pork side against said conveyor means.

31. A loin pull and rib cut machine according to claim 29 wherein said means to bias said drum comprises a fluid pressure operated cylinder acting as an air spring to force said drum downward against the pork side.

32. A loin pull and rib cut machine according to claim 31 wherein means is responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure operated cylinder in the opposite direction.

33. A loin pull and rib cut machine according to claim 1 wherein said rib cut means comprises a rib cut knife and freely rotatable drums to bias the pork side against said conveyor means while it is drawn past said rib cut knife.

34. A loin pull and rib cut machine according to claim 33 including means to raise said drums and said rib cut knife out of the pork side at the end ol the rib cut operation. said means to raise comprises a fluid pressure operated cylinder and delayed action actuat' ing means therefor responsive to the arrival of the ad vance edge of the pork side past said rib cut knife.

35. A loin pull and rib cut machine according to claim 34 wherein means is provided after the ribs are 

1. In a loin pull and rib cut machine, conveyor means operable to convey pork sides through said machine, said machine having a loin pull station, a loin push-off station and a rib cut station, loin pull mechanism at said loin pull station comprising a scribe saw and a U-shaped loin pull knife, said scribe saw being positioned with respect to said conveyor means to scribe the ribs of the pork side adjacent one edge of the loin, said loin pull knife having a portion immediately following said scribe saw and a portion to cut under the loin, means for causing said scribe saw and said portion immediately following it to follow the shape of the loin comprising a shoe carried by said scribe saw and adapted to follow the contour of the back bone Of the pork side, means to bias said shoe toward the back bone, means at said pushoff station to push the cut loin from the pork side, and means at said rib cut station to cut the ribs from the pork side.
 2. A loin pull and rib cut machine according to claim 1 wherein said means for causing said scribe saw and said portion of said loin pull knife immediately following said scribe saw to follow the shape of the loin comprises a fluid pressure cylinder normally operable to position said scribe at a diagonal to the line of travel of said conveyor means, and means responsive to the pork side when it arrives at a predetermined position on said conveyor means to operate said cylinder to position said scribe saw substantially parallel to the line of travel of said conveyor means.
 3. A loin pull and rib cut machine according to claim 2 including means operable to lift said loin pull knife, said lift means comprising a roller coacting with a cam as a result of said cylinder responding to said means responsive to the pork side when it arrives at a predetermined position on said conveyor means.
 4. A loin pull and rib cut machine according to claim 1 wherein additional conveyor means are provided for positively advancing the pork side before it reaches said loin pull station and comprises a gripper conveyor having gripper lugs biased to engage the back bone portion of the pork side.
 5. A loin pull and rib cut machine according to claim 4 wherein means is provided between said loin pull station and said push-off station for feeding the pork side comprising a knobbed drive-drum, and means to bias said drum toward the pork side comprising fluid pressure operated means also responsive to the position of the pork side when it arrives at said predetermined position.
 6. A loin pull and rib cut machine according to claim 4 wherein fluid pressure operated means is provided to operate said push-off means, and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure operated means.
 7. A loin pull and rib cut machine according to claim 4 wherein means is provided between said push-off station and said rib cut station to feed the pork side and comprises knobbed drums and means to bias said drums against the pork side.
 8. A loin pull and rib cut machine according to claim 4 wherein said rib cut means comprises a rib cut knife and freely rotatable drive-drums to hold the pork side against said conveyor means under bias.
 9. A loin pull and rib cut machine according to claim 4 wherein fluid pressure operated means is provided to operate said push-off means, said push-off means having spring extended shoes to enter the saw cut in the pork side and engage the adjacent edge of the loin to effect push-off thereof with respect to the remaining portion of the pork side, and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure operated means.
 10. A loin pull and rib cut machine according to claim 4 wherein said means to bias said gripper chain against the pork side comprises fluid pressure operated cylinder means and an adjustable pressure regulator for supplying fluid under pressure thereto.
 11. A loin pull and rib cut machine according to claim 10 wherein said means to bias said shoe toward the back bone comprises a fluid pressure operated cylinder, and means responsive to the pork side when it arrives at a predetermined position to control said cylinder.
 12. A loin pull and rib cut machine according to claim 11 wherein a fluid pressure operated means is connected with said scribe saw and said shoe for elevating them and a manually actuated jam valve is provided for actuating said cylinder.
 13. A loin pull and rib cut machine according to claim 12 wherein said means for causing said scribe saw and said first portion of said loin knife to follow the shape of the loin comprises a fluid pressure cylinder normally operable to positiOn said scribe saw at a diagonal to the line of travel of said conveyor means, means responsive to the pork side when it arrives at a predetermined position on said conveyor means to operate said cylinder to position said scribe saw substantially parallel to the line of travel of said conveyor means, wherein fluid pressure operated means is provided to operate said push-off means, and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure means.
 14. A loin pull and rib cut machine according to claim 12 wherein means are provided for actuating said jam valve so as to operate said fluid pressure operated cylinder means in the reverse direction.
 15. A loin pull and rib cut machine according to claim 10 wherein a drive-drum is provided to feeding the pork side between said loin pull station and said push-off station, and a fluid pressure operated cylinder biases said drive-drum toward said conveyor means and is controlled by said means responsive to the pork side when it arrives at a predetermined position.
 16. A loin pull and rib cut machine according to claim 4 wherein a rider arm is biased to engage the rib portion of the pork side and force it toward said conveyor means.
 17. A loin pull and rib cut machine according to claim 4 wherein said lugs of said gripper conveyor are tapered and are provided with pork side engaging points and said conveyor means has lugs thereon opposite said gripper conveyor to prevent slippage of said conveyor means under the pork sides.
 18. A loin pull and rib cut machine according to claim 12 wherein said jam valve also actuates said fluid pressure operated cylinder means to bias said gripper conveyor against the pork side in a contra-biasing direction.
 19. A loin pull and rib cut machine according to claim 18 wherein a rider arm is biased to engage the rib portion of the pork side, and fluid pressure operated means is provided to effect such bias, said jam valve being also operable to actuate said last mentioned fluid pressure operated means in a contra-biasing direction.
 20. A loin pull and rib cut machine according to claim 1 wherein means is provided between said loin pull station and said push-off station to bias the pork side against said conveyor means.
 21. A loin pull and rib cut machine according to claim 20 wherein means is provided between said push-off station and said rib cut station to feed the pork side and comprises knobbed drums, and means to bias said drums against the pork side.
 22. A loin pull and rib cut machine according to claim 20 wherein said rib cut means comprises a rib cut knife and freely rotatable drive-drums biased to hold the pork side against said conveyor means.
 23. A loin pull and rib cut machine according to claim 20 wherein said means to bias the pork side against said conveyor means comprises a knobbed drive-drum and fluid pressure operated means normally biasing said drive-drum away from the pork side, and including means responsive to the pork side when it arrives at a predetermined position on said conveyor means and being also operable to actuate said fluid pressure operated means in a direction contra-normal to engage said drive-drum with the pork side.
 24. A loin pull and rib cut machine according to claim 23 wherein a jam valve is provided to actuate said fluid pressure operated means normally biasing said drive-drum away from the pork side in said normally biased direction.
 25. A loin pull and rib cut machine according to claim 20 whererin means is provided responsive to the pork side when it arrives at a predetermined position on said conveyor means to operate said means between said loin pull station and said push-off station to bias the pork side against said conveyor means.
 26. A loin pull and rib cut machine according to claim 1 wherein fluid pressure operated means is provided to operate said push-off means, and means responsive to the position of the pork side on said conveyor means after the Loin has been pulled to actuate said fluid pressure means.
 27. A loin pull and rib cut machine according to claim 26 wherein means is provided between said push-off station and said rib cut station to feed the pork side and comprises knobbed drums, and means to bias said drums against the pork side.
 28. A loin pull and rib cut machine according to claim 26 wherein said rib cut means comprises a rib cut knife and freely rotatable drive-drums to hold the pork side against said conveyor means under bias.
 29. A loin pull and rib cut machine according to claim 1 wherein means is provided between said push-off station and said rib cut station to further feed the pork side and comprises a knobbed drum and means to bias said drum against the pork side.
 30. A loin pull and rib cut machine according to claim 29 wherein said rib cut means comprises a rib cut knife and freely rotatable drive-drums to bias the pork side against said conveyor means.
 31. A loin pull and rib cut machine according to claim 29 wherein said means to bias said drum comprises a fluid pressure operated cylinder acting as an air spring to force said drum downward against the pork side.
 32. A loin pull and rib cut machine according to claim 31 wherein means is responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure operated cylinder in the opposite direction.
 33. A loin pull and rib cut machine according to claim 1 wherein said rib cut means comprises a rib cut knife and freely rotatable drums to bias the pork side against said conveyor means while it is drawn past said rib cut knife.
 34. A loin pull and rib cut machine according to claim 33 including means to raise said drums and said rib cut knife out of the pork side at the end of the rib cut operation, said means to raise comprises a fluid pressure operated cylinder and delayed action actuating means therefor responsive to the arrival of the advance edge of the pork side past said rib cut knife.
 35. A loin pull and rib cut machine according to claim 34 wherein means is provided after the ribs are cut from the pork side to further advance the pork side along the conveyor and aid in pulling it through said rib cut knife.
 36. A loin pull and rib cut machine according to claim 1 wherein said scribe saw and said loin pull knife are mounted for substantially free vertical and horizontal movement, the weight thereof effecting operative engagement thereof with the pork side, and a counterweight to effect the bias of said shoe toward the back bone of the pork side.
 37. A loin pull and rib cut machine according to claim 1 wherein said scribe saw and said loin pull knife are mounted for substantially free vertical and horizontal movement, said loin pull knife is adjustable in width, and means is responsive to the size of the pork side to move said loin pull knife vertically and adjust it to a narrower width as the loin pull knife rises, thereby controlling the fat thickness left on the loin.
 38. A loin pull and rib cut machine according to claim 37 wherein said U-shaped loin pull knife is flexible to vary the width of the loin(,) cut thereby and means is responsive to the size of the pork side to control the fat thickness left on the loin.
 39. A loin pull and rib cut machine according to claim 1 wherein means is provided to lift said loin pull knife to follow the contour of the pork side, and then lower it to resume cutting the loin.
 40. A loin pull and rib cut machine according to claim 39 wherein said scribe saw is initially diagonal to the line of travel of said conveyor means, and is thereafter positioned substantially parallel to the line of travel of said conveyor means, and said means operable to lift the loin pull knife comprises cam and roller means to effect such lifting upon said scribe saw knife assuming said diagonal position.
 41. In a loin pull machine, conveyor means operable to convey pork sides through said machine, loin pull mechanism comprising a scribe saw and means for cutting a loin from each of said pork sides, said scribe saw being positioned with respect to conveyor means to scribe the ribs of the pork side adjacent one edge of the loin, said loin cutting means having a portion immediately following said scribe saw and a portion to cut under the loin, means for causing said scribe saw and said portion immediately following to follow the shape of the loin comprising a shoe carried with the scribe saw and adapted to follow the contour of the backbone.
 42. A loin pull machine according to claim 41 wherein said means for causing said scribe saw and said portion of said loin cutting means immediately following said scribe saw to follow the shape of said loin comprises a fluid pressure cylinder normally operable to position said scribe saw at a diagonal to the line of travel of said conveyor means, and means responsive to the pork side when it arrives at a predetermined position on said conveyor means to operate said cylinder to position said scribe saw substantially parallel to the line of travel of said conveyor means.
 43. A loin pull machine according to claim 42 including means operable to lift said loin cutting means said lift means comprising a roller coacting with a cam as a result of said cylinder responding to said means responsive to the pork side when it arrives at a predetermined position on said conveyor means.
 44. A loin pull machine according to claim 41 including means to bias said shoe toward the backbone said bias means including a fluid pressure operated cylinder, and means responsive to the pork side when it arrives at a predetermined position to control said fluid pressure operated cylinder.
 45. A loin pull machine according to claim 44 wherein said means for causing said scribe saw and said first portion of said loin cutting means to follow the shape of the loin comprises a fluid pressure cylinder normally operable to position said scribe saw at a diagonal to the line of travel of said conveyor means, means for pushing said loin from said conveyor, means responsive to the pork side when it arrives at a predetermined position on said conveyor means to operate said cylinder to position said scribe saw substantially parallel to the line of travel of said conveyor means, wherein fluid pressure operated cylinder means is provided to operate said loin pushing means, and means responsive to the position of the pork side on said conveyor means after the loin has been pulled to actuate said fluid pressure operated cylinder means.
 46. A loin pull machine according to claim 45 including means for operating said fluid pressure operated cylinder means in the reverse direction.
 47. A loin pull machine according to claim 41 wherein said scribe saw and said loin cutting means are mounted for substantially free vertical and horizontal movement, the weight thereof effecting operative engagement of said saw and said loin cutting means with the pork side, and a counterweight for biasing said shoe toward the backbone of the pork side.
 48. A loin pull machine according to claim 41 wherein said scribe saw and said loin cutting means are mounted for substantially free vertical and horizontal movement, said loin cutting means is adjustable in width, and means is responsive to the size of the pork side to move said loin cutting means vertically and adjust it to a narrower width as the loin cutting means rises, thereby controlling the fat thickness left on the loin.
 49. A loin pull machine according to claim 41 wherein said loin cutting means is a U-shaped loin pull knife having spaced legs and said legs are flexible to and away from each other to vary the width of the loin cut thereby and means is responsive to the size of the pork side to control the fat thickness left on the loin.
 50. A loin pull machine according to claim 41 wherein means is proviDed to lift said loin cutting means to follow the contour of the pork side, and then lower it to resume cutting the loin.
 51. A loin pull machine according to claim 50 including means for positioning said scribe saw for initially diagonal to the line of travel of said conveyor means, and for thereafter positioning said scribe saw substantially parallel to the line of travel of said conveyor means, and said means operable to lift the loin pull knife comprises cam and roller means to effect such lifting upon said scribe saw knife assuming said diagonal position.
 52. A loin pull machine according to claim 41 including means downstream of the loin cutting means for feeding the pork side comprising a knobbed drive-drum, and means to bias the knobbed drive-drum toward the pork side comprising fluid pressure operated means also responsive to the position of the pork side when it reaches a predetermined position on said conveyor means.
 53. A loin pull machine as in claim 52 wherein the fluid pressure operated means is operable to engage said knobbed drive-drum with the pork side.
 54. A loin pull machine as in claim 53 wherein a jam valve is provided to actuate said fluid pressure operated means normally biasing said knobbed drive-drum away from the pork side in said normally biased direction.
 55. In a rib cut machine, conveyor means operable to convey pork sides through said machine, and means to cut the ribs from the pork sides, said rib cut means comprising a rib cut knife and freely movable drive means to hold the pork side against the conveyor means under bias.
 56. A rib cut machine according to claim 55 including means to raise said drive means and said rib cut knife out of the pork side at the end of the rib cut operation, said means to raise comprises a fluid pressure operated cylinder and delayed action actuating means therefor responsive to the arrival of the advance edge of the pork side past said rib cut knife.
 57. A rib cut machine according to claim 56 wherein means is provided after the ribs are cut from the pork side to further advance the pork side along the conveyor and aid in pulling it through said rib cut knife.
 58. A rib cut machine according to claim 55 wherein the rib cut knife is arranged diagonally to the direction of travel of the conveyor means. 